Description of Excorallana yamamuroae sp.
nov., (Crustacea, Isopoda) preliminary record of the genus in Japan
journal or
publication title
Bulletin of the Toyama Science Museum
number 12
page range 13‑17
year 1988‑10‑31
URL http://repo.tsm.toyama.toyama.jp/?action=repos itory̲uri&item̲id=558
BulletinoftheToyamaScienceMuseumNo、12,pp13‑17:(1988)
DescriptionofExcoγα〃α"α〃α"lα"呪oaesp、nov.,(Crustacea,Isopod露 preliminaryrecordofthegenusinJapan*
A
NoboruNunomura ToyamaScienceMuseum
日本近海から初めて報告されたキバウオノエ属(甲殻類:等脚目)の一新種、
E節 、脆"αvα池α脚"わ の記載
布 村 昇 富山市科学文化センター
鹿児島県上甑島の汽水湖、貝池から発見された戯 7〃んγzα属(甲殻類、等脚目)を新種 Er "tz? yα加α班況γ0 (和名:ヒメキバウオノエ)として記載した。本種はアメリカ太 平洋岸バハ・カリフォルニアから知られているEカブ 畑"α〃α〃 ノi(ze(Menzies)と最も類似 するが、(1)腹尾節側方のくぼみの欠如、(2)体の後方の剛毛の欠如、(3)第一触角の 第一節が著しく肥厚していること、(4)腹部の代わりに胸部後半の背板に突起が有ること 等で区別される。本種はまた、西インド諸島から知られているE虻CO 伽"as"6"/"sとも類 似するが、(1)オス胸部背板に突起が有ること、(2)腹尾節が後端が丸いこと、(3)目 が比較的小さいこと、(4)胸部基板が、より顕著であること、(5)第一触角鞭数が多い
こと等によって区別される。
newspeciesofisopod,belongingtotheflabelliferanfamilyCorallanidae,ishere edfromthebrackishwateroftheLakeKai‑ike,Kami‑koshikilslands,Kagoshima
describedfromthebrackishwaterottheLaKe腿al‑lKe,瓜aml‑KosnlKllslanus,nagusllluld
ken,Kyushu,westemJapan・
IwishtoexpressmyheartythankstoDr,MasumiYamamuro,theUniversityofTokyo:
forherkindnessincollectingsuchinterestingspeclmens.
GenusExcoγα〃α〃αStebbing
(Japname:Kiba‑uonoe‑zoku,new)
ThismaybethefirstrecordofthegenusE妬CO、"ααfromJapananditsneiboring
ExcoFα〃α〃αJamαm〃γOaEsp.、0V.,
(Japanesename:Hime‑kibauonoe,new)
(Figs、1‑2)
Mz"γ E、 " :1罰(holotype,8.6mminbodylength),2早早(l¥allotype,88mm inbodylengthandlギparatype,9.4mminbodylength),LakeKai‑ike,Kamikoshikilsland, Kagoshimaken,coll、MasumiYamamuro,Nov.,l984i2¥早(5.6〜5.9mminbodylength),
*ContributionsfromtheTovamaScienceMLlseum,No.73
1イ〕
1 0
NoboruNunomul・a
Kai‑ike,Au9.25,1985.Typeseriesisdepositedasfollows:Holotype(TOYA−Cr7632): allotype(TOYA‑Cr7633)andaparatype(TOYA‑Cr7634)attheToyamaScienceMuseum aparatype(OMNHAr‑3255)attheOsakaMuseumofNaturalHistory,andaparatype (NSMTCr‑9391)attheNationalScienceMuseum,Tokyo・
Dgscγゆ"0〃:Male‑Bodyoblong,about2.3timesaslongaswideColordullyellow inalcohol・Cephalontrapeozoidalinshapeandbearsapairofprojectionsonanterodorsal part,Eyesratherbig,eachcomposedofabout70ommatidia,PereoniteslV‑VIIsomewhat longerthantheanteriorones・Epimeraofpereonitesll‑VIIdistinctandratherbig・ PereonitesVandVIIwithapairofratherremarkableprojectionsoneachposteriorpart・ PereoniteVIwith2pairsofprojectionsonposterodorsalpart,Pleonitelinvisibleindorsal view,PleonitesllandlⅡalmostequalinlength・PleonitelVexpandedposteriorlyinboth lateralsides,PleoniteVratherlongthananyotherpleonitesandwithalowprojectionsat medialpart,Pleotelsonalmosttriangularandroundinapicalpart・Bothramiofuropodas
equallyprotrudedbackwards,
Antennule(Fig.2A),reachingpereonite2,composedofl4segmets,1stsegmentbigand
Fig.1EZY 畑"tz刀αyα郷α加況 sp、nov.,
A,Dorasalviewofholotypemale;B,Dorsalviewofallotypefemale;C・Mandible言 D、Maxillule;EMaxilla;F,Maxilliped(C‑F、holotypemale).
14
、露c,が"0〃Q/、ajVを加助jesQ/Excorallanayamamuroae加〃霊
︽
一 シ 李 一 二
A
︑¥
,
面=
ころ
柵が '/"W州 言、
Fig.2EY γtz"α"α 柳α加岬り sp,nov.,
A,Antennule;BAntenna;C‑I、Pereopodsl7;J,Pleopod2inmale;K、Uropod
(All:holotypemale).
almostsquare,
Antenna(Fig2B),reachingtheanterlormarginofthe5thpereonalsomite,peduncular composedof5segmentsandHagellumcomposedof24segments・
Mandible(Fig.1C)withlowcuttingedge;palpwithsegment2morethantwicelonger thanlor3;lateralmarginofsegment2with41argeand3moderatelystiffsetae,
Maxillulle(Fig.1,);outerlobeformingasingle,largeandrecurvedtooth, Maxilla(Fig.1E)rectangularwithabigprocess.
1上
Nobor●uNunomura
Maxilliped(Fig.1F);enditesmall;palp5富segmented,1stto4thsegmentssubequali塗
length;terminalsegmentsmallthantheotherones,
Pereopodsl〜3(Fig.2C‑E);basisbigandrectangular;ischiumsmallandtriangular; carpustriangularwith3setaeonmnermarginand3〜4setaeonouterdistalcorner;carpus
short;propodusstout、
Pereopods4〜6(Fig.2F−H);basisoblong;ischiumelongatedtriangular,with3groups ofsetaeoninnermargi、;merusrectangularwith2groupsof3setaeonlnnermargin;carpus rectangularwith2groupsof2setaeoninnermargln;propodusratherlong・
Pereopod7(Fi9.21);basisbigandrectangular;ischiumlongwith3;merusquadrate二
carpusrectangular;propoduselongated、
Penesunfortunatelybroken・
Pleopod2(Fig.2J);endopodrectangularwithanarrowandlinearstylus,almostaslong
asendopod;exopodrectangularbutnarrowerthanendopod,
Uropod(Fi9.2K);basistriangular;endopoditeovatewithafringedsetaeand9spines aroundthemargin;exopoditelanceolatewithmanysetaeand5〜6spinesaroundthemargin Female‑Similartomalebutwithoutanytuberclesondorsalsurfaceofpereonai
somltes・
Rg畑α戒s:ThepresentnewspeciesismostcloselyalliedtoEr?〃〃"αだ〃αereported fromBajaCalifomia,NorthAmerica,butthenewspeciesisseparatedfromE・片αオルinthe followingfeatures:(1)lackofnotchesoflateralpartofpleotelson,(2)lackofsetaon posteriorhalfofthebody,(3)remarkablystoutlstpedunclarsegmentofanteImuleand(4〉 presenceoftuberclesontheposteriorhalfofpereonalsomites,
ThepresentnewspeciesisalsoaⅡiedtoEス、/""as"6"/応(Hansen)reportedfromSt・ Thomas,Westlndies・ButthenewspeciesisseparatedfromE.s"6"〃sinthefoⅡowing features:(1)presenceoftuberclesonthedorsalsurfacesof5thto7thpereonalsomitesin male,(2)rounderposteriormarginofpleotelson,(3)smallereyes,(4)moreprommenteplmera ofpereonalsomitesand(5)morenumeroussegmentatlonsofHagellaofantennule
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